Title (de)

Title (fr)

Publication

Application

Priority

JP 32994499 A 19991119

Abstract (en)

An improved DC power supply apparatus which can be driven with high efficiency without power loss even with a light load connected to the DC power supply apparatus. The average value signal generation circuit 25 of a DC-DC converter 11 serves to average the control signal as outputted from a second control circuit 13 and output the averaged signal to the first control circuit 25 of a power factor correction circuit 24. The first control circuit 26 of the power factor correction circuit 24 is powered by a DC voltage generated by means of a capacitor 22 and a diode 21. When a predetermined time elapses after powered, the first control circuit 25 serves to alternately turn on and off the first switching circuit 8 if the average value signal as output from the average value signal generation circuit is no lower than the predetermined reference value and, on the other hand, serves to stop alternately turning on and off the first switching circuit 8 if the average value signal as output from the average value signal generation circuit is no higher than the predetermined reference value. <IMAGE>